Packing-ring.



E. B. CAMPBELL. PACKING RING.

APPLIOATION FILED JULY 28, 1913..

1,087,213. Patented Feb. 17, 1914.

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UNITED STATES PATENT OFFICE.

EDWARD B. CAMPBELL. OF ST. LOUIS. MISSOURI. ASSIGNOR TO STA TITE PACKINGRING COMPANY, OF ST. LOUIS, MISSOURI. A CORPORATION OF MISSOURI.

PACKING-RING.

To all 21;]; nm it may concern Be it known that I, EDWARD B. CAuPnnLL, acitizen of the United States, residing at the city of St. Louis andState of Missouri, have invented a new and useful Packing-Ring, of whichthe following is a specification}.

This invention relates to packingi'ings of the type. used in connectionwith pistons and itconsists of the novel construct-ion, combination andarrangement of parts, having the novel relative action and adjustment,hereinafter shown, described and set forth in the appended claims.

An object of the invention is to provide an improved packin consistingessentially of a number of metallic rings having a relative resilientaction, so that when assembled in position upon the piston they willimpart a uniform pressure against the inner surface of the cylinderthroughout their circumference, even if the cylinder becomes worn and isnot a true and exact circle.

Another object is to provide an improved packing consisting of a numberof resilient outer rings of the open type cut from a cylinder having thesame diameter as the interior of the cylinder in which the rings are tooperate, in combination with an inner ring ofthe resilient open type outfrom a cylinder of the same diameter as the cylinder from which theouter rings are cut, andcompressed so that the outer rings will encirclethe inner rin and be expanded in a -form to fit the cylinder wall, andresilient members interposed between the outer and inner rings alsoactin to expand the outer rings to fit thecylin er wall, so that theringsthroughout their circumference will be pressed equally anduniformly against all parts of the interior oft-he cylinder wherein theyoperate even if. the walls are not a true circle. v

Other obj cots to be attained by this invention, and many advantages ofthe invention, will be apparent to those skilled in the art withoutspecific mention thereof, and it will be understood thatflI-do notrestrict-myanvention nor the scope of the appended claims by theomission of a statement of any of the objects and advantages of theinvention. In the accompanying drawings I have illustrated, a preferredembodiment of the invention,.in which Figure l is a longitudinalsectional view of a portion of a piston cylinder, illustrat-Specification of Letters Patent.

Application filed July 28, 1913.

Patented Feb.17, 1914. Serial No. 781,478.

ing a piston mounted therein equipped with packing rings constructed inaccordance with my invention. Fig. 2 is an enlarged view of the packingring removed from the piston, showing the uniform expansion of theseveral rings due to their resiliency. Fig. 3 is an elevation of the tinshowing the separation of the ends of one oFthe outer rings due to theresiliency of said outer ring and of the inner ring and the unitingillustrating a connection which may beem-' ployed for uniting the endsof the keys withthe inner ring.

As illustrated in'the drawings the piston 1 is of the reciprocatingtype, and is-mounted within a cylinder 2 ofusual construction. Power istransmitted from the piston 1 through the medium of a piston rod 3 whichis connected to the piston by the common pivot connection 4. A number ofannular channels or grooves are formed in the periphery of the piston 1,and within these annular channels or grooves the packing rings aremounted.

The construction and relative arrange ment of the packing areillustrated in Figs. '2 to 6, inclusive, in which it will be seen thateach packing cons'ists of a resilient inner ring 5 originallyZ cu-t-ffrom a cylinder havin the same diameter as the interior of the cylinder,and having a portion removed so that said ring may be compressed to fitwithin one of the channels or grooves around the piston. Each ring 5 isencircled by two resilient outer rings 6 which are cut from a cylinderof the same diameter as the interior of the piston and which, when'inassembled relation upon the ring 5, occupy the positions shown in Fig.2. The width of each outer ring equals one half of the width of theinner' ring 5, so that when the rings are assembled they fit .closelywithin the channels or grooves around the piston. Theseveral rings areofthe open type, and

when they are assembled it is preferable that the open end of each ringbe separated.

with two encircling grooves, and the inner face of each of the rings 6is provided with a single groove arranged to register with or match oneof the grooves in the ring 5. These matching grooves constitute keyseats adapted to receive the keys 7 which are of resilient'metal, andwhich also impart an outward pressure against the outer rings 6throughout their circumference, thereby cooperating with the ring 5 inthis action. The keys T may be connected with the rings 5 by havingangular extensions 8 projecting into holes formed in sa-iillrings 5, asillustrated in Figs, 2 and,6. Til; e opposite end of each key 7 may beprovided with an extension 9 engaging the end of the corresponding ring6 effectively to prevent turning of the rings Gupon the ring 5.

All of the rings may be formed by cutting sections from the samecylinder, and of the same diameter as the interior of the cylinder 1;and forming the necessary key seats in the inner surfaces of the rings 6and in the outer surface of the ring 5. After being cut from thecylinder the ring-sections are cut to form rings of the open type, andmay then be assembled within the channels or grooves in the piston in'anobvious manner. When assembled on the piston the rings 6 are given atendency by the ring 5 and the keys 7 to expand to a greater-diameterthan the interior of the cylinder, and since all. of the rings and thekeys are of resilient material the rings (3 are caused to impart auniform pressure against the cylinder throughout their periphery.

I am aware that there may be variations in the construction andarrangement of the different-parts, and that the rings may be made ofvarious diameters and dimensions. I contemplate such variations as maybe found necessary under different service con ditions, and I do notrestrict myself to the specific features of arrangement and con=struction shown except where specifically set forth in the appendedclaims.

lVhat I claim and desire to secure by Let ters Patent is:

1. The combination with a cylinder, and

5 a piston arranged to reciprocate in said cylinder, of two rings of theopen type mounted on said piston, an expansion ring impartingoutward'pressure against both of said rings, an expanding locking keyring acting against each of said first-named rings effectively to expandsaid rings independently of each other and in conformity with any wornportions of the cylinder, whereby a tight and close joint will be madeby one or another of said rings where parts of the cylinder are wornfrom a perfect circle.

2. The combination with a cylinder, and a piston arranged to reciprocatein said cylinder, of a packing revolubly mounted on the piston andcomposed of two rings whose exterior circumference when in perfectcircular form is the sameas the interior circumference of the cylinder,a third ring whose exterior circumference when in perfect circular formis the same as the circum ference of said two rings and as the interiorcircumference of the cylinder encircled and compressed by said tworings, and resilient devices uniting said two rings with said third ringand locking said'two rings and said third ring together, substantially.as.

specified.

3. The. combination with a piston having a circumferential groove, aninner ring of the resilient open type revolublv seated in said groove,and two outer rings of the reinner ring and arranged to impart expanding pressure against said outer rings.

5. A packing for pistons comprising a resilient open inner ring having aplurality of grooves -.in its outer surface, a number of resilient openouter rings encircling and expanded by the pressure of said inner ringand having grooves in their inner surface matching the grooves on saidinner ring, and resilient keys mounted between said rings and fitting insaid matching grooves and imparting expanding pressure against saidouter rings, substantially as specified.

6. A packing for pistons comprising a re silientinnerring, key seatsformed in the periphery of said inner-ring, resilient outer ringsencircling andexpanded by the'pressure of said inner ring, a key seatformed in each of said outer rings matching said key seats in said innerring respectively, and

keys seated in said key seats between said rings and preventingrelativerotation of. said rings, substantially asspecified.

7. The combination with a cylinder, and a piston operatin in saidcylinder and provided with a circumferential groove, of a ring seated insaid groove and being compressed from an annulus having the sameexternal diameter as the interior of said cylr,

inder, two rings encircling said first-named- 8. A packing for pistonscomprising a compressed ring of the open type automati cally expansibleto a ring portion having the same external diameter as the diameter ofthe interior of the cylinder in which it is to operate, in combinationwith a number of rings of the same diameter as is said first- Copie': ofthis patent may be obtained for named ring before, it;-iscompressedencircling said first-named ring and pressing against the interiorsurface of the cylinder.

9. The combination with a cylinder, and a piston arranged to reciprocatein said cylinder and provided with a circumferential groove, of aresilient ring having the same external diameter as the interiordiameter of the cylinder and havingan open space at one side thereof,said ring beingncompressed and seated within said groove, a number of"circumferential key seats formed in said ring, two outer ringsencircling and compressing said first-named ring and being-ac t-uatedradially by said first-named ring, a key seat formed in the innersurface of each of said outerrings, and expanding keyrings.

mounted in said key seats and preventin relative movement of said outerrin an said inner ring, substantially as speci "ed.

In witness whereof, I have; signed this specification in the presence oftwo subscribing witnesses. EDWARD B. CAMPBELL.

Witnesses: R. M. LAWRENCE, I J. D. RIP EYJ five cents each, byaddressing the Commissioner of Eaten, Washington. D. c."

